<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="UTF-8">
	<title>Title</title>
</head>
<body>

</body>
<script>
	const obj = {
		a:1,
		b:2,
		c:3,
		info:{
			userName:"zhangsan"
		}
	}
	delete obj.a;
	delete obj.b;
	delete obj.info.userName;
	console.log(obj);
</script>
</html>